JPH08248244A - Optical fiber branching cord - Google Patents

Abstract

PURPOSE: To decrease the number of parts and man-hours for working by forming plural systems of optical fibers connected to a multiple fiber connector as plural wires of coated fibers, connecting connectors for single fibers discretely to their front ends and fixing a coated fiber assembly part by a resin. CONSTITUTION: This branching cord is composed of the required number of the coated optical fibers 1, the single fiber optical fiber connector 2 of the same number as the above number and the multiple fiber optical fiber connector 3. The single-fiber optical fiber are formed as the fibers from which the coatings are removed on the multiple fiber connector 3 side. The coated optical fibers 1 are applied with secondary coatings of a UV curing type resin, etc. The single fiber optical fiber connectors 2 are mounted respectively at the one-side ends of the respective single fiber coated optical fibers 1. The secondary coatings of the required length are removed at the other-side ends to form the optical fibers. The ends of the optical fibers are directly connected to the multiple fiber optical fiber connector 3. The assembly part of the coated optical fibers 1 is fixed by the UV curing type resin. Then, the need for cutting apart and branching the multiple fiber coated optical fibers is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber branch cord for branching and converting a multi-core optical fiber cord such as a cable from an optical fiber cable or wiring in a device into a single-core optical fiber.

[0002]

2. Description of the Related Art In the case of withdrawing from an optical fiber cable or wiring inside a device in optical communication or the like, it is often necessary to convert a multi-core optical fiber cord into a single-core optical fiber core for wiring. In such a case, for example, an optical fiber branch cord as shown in the schematic view of FIG. 2 is used. The figure will be described below.

In FIG. 2, a multi-core type optical fiber connector 22 is connected to one end of a multi-core optical fiber cord 21 having a required number of cores (an example of four cores is shown in the figure).
The multi-core optical fiber cord 21 is cut in the middle and branched into individual single-core optical fiber core wires 23, and a single-core optical fiber connector 24 is connected to each terminal thereof. Reference numeral 25 is a reinforcing tube, and 26 is a branch reinforcing portion.
The branch portion of the multi-fiber optical fiber cord 21 is not shown because it is housed in the branch reinforcing portion 26 in the figure, but on the multi-fiber optical fiber cord 21, the branch portion is close to the branch portion. 25 is covered, and a protective tube 27 is covered on each single-core optical fiber core wire 23. The branch portion of the multi-core optical fiber cord 21 which is not shown, the end portion of the reinforcing tube 25 and the single core. An optical fiber branch cord is configured by providing the branch reinforcing portion 26 so that the end of the protective tube 27 on the optical fiber core is housed. By using this optical fiber branch cord, the multi-core optical fiber cord is branched and converted into a single-core optical fiber core wire. If it is necessary to change the arrangement order of the optical fiber core wires in the multi-core optical fiber cord to make the arrangement order of the single core optical fiber core wires different, the optical fiber core wires are crossed in the branch reinforcing section 26. Can be done.

[0004]

In the conventional optical fiber branching cord, for example, it was necessary to cut a multi-core optical fiber cord, which is integrally formed in a tape shape, and branch it into single-core optical fibers. In addition, the number of parts required for assembly is large, and the processing requires a long time. In addition, when wiring to a device or the like, a bulky and large storage volume is required due to the reinforcing tube and the branch reinforcing portion. Therefore, this is an obstacle to downsizing of devices, and it has been desired to further downsize the optical fiber branch cord.

[0005]

The present invention has been made to solve the above problems. The use of the multi-core optical fiber cord as in the conventional optical fiber branch cord is stopped, and the single-core optical fiber core wire is directly connected to the multi-core optical fiber connector. That is, in an optical fiber branch cord for branch-converting a multi-core optical fiber cord into a single-core optical fiber core wire, an optical fiber branch cord for branch-converting a multi-core optical fiber cord into a single-core optical fiber core wire respectively, a multi-core connector The multi-fiber optical fiber bundle is formed by connecting the multiple optical fiber element wires connected to each other to a multiple optical fiber core wire, and connecting each end of each optical fiber core wire individually to a single core connector. An optical fiber branch cord characterized in that it is fixed with a resin at a predetermined pitch, and as the fixing resin used here, an ultraviolet curable resin is advantageous for the work, and an optical fiber element wire and The core wire gathering part should be covered with a plastic or metal outer frame to mechanically protect the part mechanically and to facilitate resin fixing work due to its shape. It can be.

[0006]

As described above, the multi-core optical fiber cord portion is eliminated, so that the branch reinforcing portion is eliminated and the required number of single-core optical fiber core wires are directly connected to the multi-core optical fiber connector. Since it is fixed at, the strength is sufficient. In this way, the number of parts is reduced, the material cost is reduced, the processing man-hour is also reduced, and it is shorter than the conventional type, and it is not bulky, so that it is possible to have a small accommodation volume in the equipment etc. Become.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view in partial cross section showing an embodiment of an optical fiber branch cord according to the present invention. This branch cord is composed of a required number of optical fiber core wires 1, the same number of single-core optical fiber connectors 2 and one multi-core optical fiber connector 3, and the used single-core optical fiber is On the multi-core connector 3 side, the coating is removed, for example, 0.
It is a 25 mm wire. The optical fiber core wire 1 is UV
Normally 0.4 with a secondary coating of curable resin or nylon
It is configured to be ~ 0.8 mm. A single-core optical fiber connector 2 is attached to one end of each of the single-core optical fiber cores 1, and the other end of each of the single-core optical fiber cores 1 has the required length. The subsequent coating is removed to form the optical fiber strand. Further, the end of the optical fiber element wire is directly connected to the multi-core optical fiber connector 3, and the collecting portion of the optical fiber core wire 1 is fixed with resin to form a resin fixing portion. If an ultraviolet curable resin is used as this resin, the work is easy. Further, if the optical fiber element wire 5 and the resin fixing portion 4 are covered with a plastic outer frame 6 for example, they are protected mechanically and environmentally. If necessary, a protective tube may be further covered on the secondary coating of each single-core optical fiber.

[0008]

According to the optical fiber branching cord of the present invention, it is not necessary to cut and branch the multi-core tape optical fiber core wire as in the conventional product, and the branched optical fiber element wire is not required to be reinforced and branched. The number of parts for forming the reinforcing portion is reduced, the number of processing steps is reduced, and a large storage volume is not required for the branch portion and the core wire reinforcement.

[Brief description of drawings]

FIG. 1 is a schematic view showing a partial cross section of an embodiment of an optical fiber branch cord according to the present invention.

FIG. 2 is a schematic diagram of an example of a conventional optical fiber branch cord.

[Explanation of symbols]

 1 Single-core optical fiber core wire 2 Single-core optical fiber connector 3 Multi-core optical fiber connector 4 Collective part (resin fixing part) of single-core optical fiber wire 5 Single-core optical fiber element wire 6 Plastic outer frame

Claims (3)

[Claims] 1. An optical fiber branching cord for branching and converting a multi-core optical fiber cord into a single-core optical fiber core wire, wherein a plurality of optical fiber element wires connected to a multi-core connector are replaced with a plurality of optical fiber core wires. The optical fiber characterized in that the end of each optical fiber core is individually connected to a single-core connector, and a multicore optical fiber core assembly is fixed to a resin at a predetermined pitch. Branch code. 2. The optical fiber branch cord according to claim 1, wherein the resin for fixing the core wire collecting portion is an ultraviolet curable resin. 3. The optical fiber branch cord according to claim 1, wherein the optical fiber element wire and the core wire collecting portion are covered and protected by an outer frame.